Stats final study set 2
An experiment consists of making 80 telephone calls in order to sell a particular insurance policy. The random variable in this experiment is the number of sales made. This random variable is a
discrete random varaible
When an experiment is conducted without replace
events are dependent
When are two experimental outcomes mutually exclusive?
if one outcome occurs, then the other cannot
Which of the following is a characteristic of the normal probability distribution?
it is bell shaped
The mean or expected value for a binomial probability distribution is
nπ
To apply a Poisson probability distribution, the mean can be computed as __________.
nπ
which of the following is a requirement
only two possible outcomes
The result of a particular experiment is called a(n)
outcome
which shape describes a poisson distribution
positively skewed
The shape of any uniform probability distribution is
rectangular
A method of assigning probabilities based upon judgment is referred to as the
subjective method
Two normal distributions are compared. One has a mean of 10 and a standard deviation of 10. The second normal distribution has a mean of 10 and a standard deviation of 2. Which of the following is true?
the dispersions of the distributions are different
The upper and lower limits of a uniform probability distribution are
the maximum and minimum values of the random variable.
Which of the following is true regarding the normal distribution?
the mean, median, and mode are all the same
which is true for a binomial distribution
the probability of success remains the same from trial to trial
If two events are independent, then their joint probability is computed with ________?
the special rule of multiplication
if two events are mutually exclusive what does the special rule of addition state?
P(A or B) = P(A) + P(B)
What does the complement rule state?
P(A) = 1 - P(not A)
which of the following is not a condition of the binomial distribution?
Sampling at least 10 trials
What kind of distribution are the binomial and Poisson distributions?
discrete
mean of a uniform probability distribution is
(a+b)/2
When applying the special rule of addition for mutually exclusive events, the joint probability is _____.
0
The total area of a normal probability distribution is _______.
1
The standard normal probability distribution is unique because it has _________.
A mean of 0 and a standard deviation of 1
a normally distributed random variable has
Any value between -∞ and + ∞.
When an event's probability depends on the likelihood of another event, the probability is a
Conditional probability
A graphical method useful in calculating joint and conditional probability is
a tree diagram
which of the following is correct about probability distributions?
all of the answers are correct
A type of probability distribution that shows the probability of success remains the same from trial to trail, is referred to as a
binomial probability distribution
The standard deviation of any uniform probability distribution is ____________.
√(b-a)^2 / 12